9b. Buds pubescent beyond the middle; inner bark of trunk red =Scarlet Oak, Quercus coccinea.= 10a. Leaves deeply pinnately lobed --11. 10b. Leaves crenate, dentate, or sinuate, not lobed --12. 11a. Leaf divided nearly to the middle by a pair of deep lateral lobes near the middle of the leaf; acorn more than half covered by the cup =Bur Oak, Quercus macrocarpa.= 11b. Leaf without a median pair of deeper lobes; acorn about one-fourth covered by the cup =White Oak, Quercus alba.= 12a. Leaves broadest at or near the middle, with numerous (8-13) sharp coarse teeth on each side =Yellow Oak, Quercus muhlenbergii.= 12b. Leaves broadest above the middle, with a few shallow, rounded or subacute teeth (7 or less on each side) --13. 13a. Large tree; leaves densely white-tomentose beneath; acorn on a stalk 3-10 cm. long =Swamp White Oak, Quercus bicolor.= 13b. Shrub; leaves thinly white-tomentose beneath; acorn sessile or nearly so =Scrub Oak, Quercus prinoides.= URTICACEAE, the Nettle Family Herbs or trees, with small inconspicuous apetalous flowers. 1a. Trees or tall shrubs --2. 1b. Herbs --7. 2a. Leaves oblong-ovate to lanceolate, serrate --3. 2b. Leaves broadly ovate to rotund, some of them lobed (Mulberry) --6. 3a. Leaves thick, coarsely and doubly serrate, broadest near the middle (Elm) --4. 3b. Leaves thin, simply serrate, broadest distinctly below the middle =Hackberry, Celtis occidentalis.= 4a. Some of the branches with flat corky wings; leaves smooth above =Cork Elm, Ulmus racemosa.= 4b. Branches without corky wings; leaves more or less rough above --5. 5a. Petioles and axillary buds glabrous =White Elm, Ulmus americana.= 5b. Petioles and axillary buds pubescent with rusty hairs =Slippery Elm, Ulmus fulva.= 6a. Leaves rough above =Red Mulberry, Morus rubra.= 6b. Leaves smooth above =White Mulberry, Morus alba.= 7a. Leaves alternate --8. 7b. Leaves opposite --9. 8a. Leaves 2-5 cm. long, stems pubescent =Pellitory, Parietaria pennsylvanica.= 8b. Leaves 8-20 cm. long; stem armed with stinging hairs =Wood Nettle, Laportea canadensis.= 9a. Twining plant; leaves serrate or cleft =Hop, Humulus lupulus.= 9b. Erect plant; leaves palmately compound =Hemp, Cannabis sativa.= 9c. Erect plants; leaves not lobed or compound --10. 10a. Stems armed with stinging hairs --11. 10b. Stems glabrous or rough, but not with stinging hairs --12.